Question

A body goes from a point A to point B 150 m apart in 30 second and return back to A in 20 second. The average velocity of the body for whole journey (in m/s) is

Answer 1

The average velocity of the body for whole journey is zero.

Given-

• Distance between A and B = 150 m
• Time taken to reach from A to B = 30 second
• Time taken to reach from B to A = 20 second

Speed from A to B = 150/30 = 5 m/sec

Speed from B to A = 150/20 = 7.5 m/sec

During the whole journey the displacement is zero.

And we know that Average velocity is defined as total displacement upon total time.

Average velocity = Total displacement / Total time

Average velocity = 0

As total displacement is zero.

Answer 2

Answer:

The average velocity of the body for whole journey is zero.

Explanation:

Given-

Distance between A and B = 150 m

Time taken to reach from A to B = 30 second

Time taken to reach from B to A = 20 second

Speed from A to B = 150/30 = 5 m/sec

Speed from B to A = 150/20 = 7.5 m/sec

During the whole journey the displacement is zero.

And we know that Average velocity is defined as total displacement upon total time.

Average velocity = Total displacement / Total time

Average velocity = 0

As total displacement is zero.